PITTSBURGH (KDKA) — The excitement, the smiles — the reactions were absolutely priceless.

It was a magical day for many patients at Children’s Hospital. They watched closely as four super heroes washed the windows.

There was Batman, Spider-Man, Captain America and Superman!

The experience was especially memorable for 16-year-old Alex Fast, a liver transplant patient, and his mom.

“I thought it was really cool. Personally, I still like superheroes,” said Alex. “I have an iPhone and I have two games where I play as superheroes or super villains.”

He and his mom are from Florida, but have been in Pittsburgh for about five and a half months.

Alex is now recovering from a second liver transplant and is a big time Batman fan.

“Probably because he doesn’t really have any superpowers,” said Alex. “He just makes due with what he has and he’s really smart.”

“It’s so wonderful,” said Michelle Smith, Alex’s mom. “Like I said, we were just going to get blood work and then to come out and have something so special… you see that on the news all the time and in the newspaper, and then like, wow, we just got to have that. It just made our day just so much more special, just something to perk you up.”

Seeing the superheroes was a treat not only for the kids, but for people of all ages.

Outside the hospital, people packed the sidewalks and snapped pictures as the window washers from Allegheny Window Cleaning repealed down the front of the building.

It was certainly a sight to see and a reminder that sometimes the smallest actions make the biggest difference.

“If you can be kind to somebody, you can make everyone’s day just so much better,” Michelle added.